Aguero is a top drawer striker, and so is Cavani. The two are a different league than Dzeko, Carroll and Guidetti.
Only Balotelli has the potential to get close to these two and have the strength to play in the Premiership.
Lavezzi would be a good signing but as a winger, more of a Thierry Henry role than a proper striker.
Aguero is also fantastic in the Argentina squad and Cavani for Uruguay. These two can play at any level in any league n the world and succeed.
Balotelli is a bit too crazy and needs to grow up to fulfil his potential, then he may be as good as the two former players. Dzeko isn't physical enough despite being a big bloke and having a successful career in Germany, he isn't strong enough on the ball and seriously lacks pace.
Carroll looks very homesick and is lacking in confidence at Liverpool. The fact he has been offered out will also dent his confidence.